Short side chain perfluorosulfonic acid membranes and their composites with nanosized zirconium phosphate: hydration, mechanical properties and proton conductivity

2012 ◽  
Vol 22 (47) ◽  
pp. 24902 ◽  
Author(s):  
Monica Pica ◽  
Anna Donnadio ◽  
Mario Casciola ◽  
Paula Cojocaru ◽  
Luca Merlo
Keyword(s):  
Mechanical Properties ◽  
Proton Conductivity ◽  
Zirconium Phosphate ◽  
Side Chain ◽  
Perfluorosulfonic Acid ◽  
Short Side ◽  
Perfluorosulfonic Acid Membranes

scholarly journals Improved Thermo-Mechanical Properties and Reduced Hydrogen Permeation of Short Side-Chain Perfluorosulfonic Acid Membranes Doped with Ti3C2Tx

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7875
Author(s):  
Panpan Guan ◽  
Jianlong Lei ◽  
Yecheng Zou ◽  
Yongming Zhang
Keyword(s):  
Mechanical Properties ◽  
Proton Conductivity ◽  
Composite Membrane ◽  
Hydrogen Permeation ◽  
Composite Membranes ◽  
Pem Fuel Cells ◽  
Proton Exchange ◽  
Side Chain ◽  
Perfluorosulfonic Acid ◽  
Short Side

Benefiting from its large specific surface with functional -OH/-F groups, Ti3C2Tx, a typical two-dimensional (2D) material in the recently developed MXene family, was synthesized and used as a filler to improve the properties of the short side-chain (SSC) perfluorosulfonic acid (PFSA) proton exchange membrane. It is found that the proton conductivity is enhanced by 15% while the hydrogen permeation is reduced by 45% after the addition of 1.5 wt% Ti3C2Tx filler into the SSC PFSA membrane. The improved proton conductivity of the composite membrane could be associated with the improved proton transport environment in the presence of the hydrophilic functional groups (such as -OH) of the Ti3C2Tx filler. The significantly reduced hydrogen permeation could be attributed to the incorporation of the impermeable Ti3C2Tx 2D fillers and the decreased hydrophilic ionic domain spacing examined by the small angle X-ray scattering (SAXS) for the composite membrane. Furthermore, improved thermo-mechanical properties of the SSC/Ti3C2Tx composite membrane were measured by dynamic mechanical analyzer (DMA) and tensile strength testing. The demonstrated higher proton conductivity, lower hydrogen permeation, and improved thermo-mechanical stability indicate that the SSC/Ti3C2Tx composite membranes could be a potential membrane material for PEM fuel cells operating above the water boiling temperature.

Water sorption and diffusion in a short-side-chain perfluorosulfonic acid ionomer membrane for PEMFCS: effect of temperature and pre-treatment

Desalination ◽  
2006 ◽  
Vol 193 (1-3) ◽  
pp. 398-404 ◽  
Author(s):  
M.G. De Angelis ◽  
S. Lodge ◽  
M. Giacinti Baschetti ◽  
G.C. Sarti ◽  
F. Doghieri ◽  
...  
Keyword(s):  
Water Sorption ◽  
Effect Of Temperature ◽  
Side Chain ◽  
Perfluorosulfonic Acid ◽  
Short Side ◽  
Pre Treatment ◽  
And Diffusion

scholarly journals Correlated interfacial water transport and proton conductivity in perfluorosulfonic acid membranes

2019 ◽  
Vol 116 (18) ◽  
pp. 8715-8720 ◽  
Author(s):  
Xiao Ling ◽  
Mischa Bonn ◽  
Katrin F. Domke ◽  
Sapun H. Parekh
Keyword(s):  
Water Transport ◽  
Proton Conductivity ◽  
Proton Exchange ◽  
Interfacial Water ◽  
Total Water ◽  
Perfluorosulfonic Acid ◽  
Water Diffusivity ◽  
Perfluorosulfonic Acid Membranes ◽  
Coherent Raman

Water must be effectively transported and is also essential for maximizing proton conductivity within fuel-cell proton-exchange membranes (PEMs). Therefore, identifying relationships between PEM properties, water transport, and proton conductivity is essential for designing optimal PEMs. Here, we use coherent Raman spectroscopy to quantify real-time, in situ diffusivities of water subspecies, bulk-like and nonbulk-like (interfacial) water, in five different perfluorosulfonic acid (PFSA) PEMs. Although the PEMs were chemically diverse, water transport within them followed the same rule: Total water diffusivity could be represented by a linear combination of the bulk-like and interfacial water diffusivities. Moreover, the diffusivity of interfacial water was consistently larger than that of bulk-like water. These measurements of microscopic transport were combined with through-plane proton conductivity measurements to reveal the correlation between interfacial water transport and proton conductivity. Our results demonstrate the importance of maximizing the diffusivity and fractional contribution of interfacial water to maximize the proton conductivity in PFSA PEMs.

Molecular Flexibility in the Short-Side-Chain Perfluorosulfonic Acid Membrane

2019 ◽  
Vol 1 (6) ◽  
pp. 207-214 ◽  
Author(s):  
Stephen J. Paddison ◽  
James Elliott
Keyword(s):  
Side Chain ◽  
Perfluorosulfonic Acid ◽  
Molecular Flexibility ◽  
Short Side
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